A fuel contamination detection system includes a fuel quality analyzer, a multiway valve, and a controller. The multiway valve includes a first inlet, a second inlet, and an outlet. The multiway valve also may include a switching device. The controller is electrically coupled to the analyzer. The controller may be coupled to the switching device, if present. Fuel is flowed through the fuel quality analyzer and an output current is measured to determine whether the fuel includes impurities. The controller is operable to signal a fuel dispensing system to dispense fuel if the fuel is sufficiently clean or cease dispensing fuel if the fuel is impure.

A refueling system for motor vehicles, that includes a motor vehicle with a first communication interface and with a control unit, as well as a refueling installation, a second communication interface, which has a communication connection to the first communication interface for the transmission of data, as well as a tank with a fuel. The refueling installation has a sensor device, which is equipped to determine a fuel material property of the fuel of the refueling installation and to transmit it to the motor vehicle, so that the control unit of the motor vehicle controls a vehicle component on the basis of the determined fuel material property.